Having just been playing it on my PS Vita - I can confirm it is a great, great game! Control is set so that the left stick is steering and right accelerate but you can soon swap that round to get the perfect RC feel. There is another control scheme to try but its great to use the true RC method and set up even if it feels a little alien to steer with the right thumb stick haha
So if it hit the Vita store this afternoon, I can assume it will be hitting the PS3 store tomorrow